The paper discusses problems encountered in the reception of wireless signals in naval ships. Certain features of apparatus which has been developed are described.The paper is divided into four principal sections:-(1) Aerials and cable systems, in which the problem of connecting the aerial to the receiver is examined.(2) General conditions to be fulfilled by naval receivers. This section contains a discussion of the problem of selectivity from the naval point of view.(3) Brief description of receivers.(4) Power supplies utilizing batteries and alternating current.